const MAX_POINTSIZE: u32 = 100;

fn main() {
    println!("=======变量=======");
    // 变量的定义
    let a = 1;
    let b: u32 = 1;
    let mut c: u32 = 1;
    c = 2;

    println!("a={}", a);
    println!("b={}", b);
    println!("c={}", c);

    println!("=======常量=======");
    println!("MAX_POINTSIZE={}", MAX_POINTSIZE);
}
